<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>login</title>
</head>
<body>
<form method="post" action="http://localhost:8081/login">
    username:<input type="text"><br>
    password:<input type="password"><br>
    <input type="submit" value="login">
</form>
</body>
</html>